Thanks for asking.
Folks with other technical backgrounds are welcome. The bar is a bit higher = we are more selective on that. Really we are looking for some web application experience, otherwise the learning curve is a bit too long, generally. [ We have more flexibility on that for in-country-Panama members. ]
So if you don't have Python, but you have Java/Ruby/PHP/Web, that sounds interesting. I would recommend someone with mainly C/Unix start building some websites and webapps of their own w/ something like Python and App Engine (little plug: request an invite to our beta for one way to get started with that). In this day and age, if you really want to be in a startup-oriented environment, it should be difficult for you to not be creating some web apps with these tech's on your own etc.
Later on we may have more flexiblity when our team is larger.